Revert of Add crash keys about field trial shared memory errors.

base/memory/shared_memory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MEMORY_SHARED_MEMORY_H_
 #define BASE_MEMORY_SHARED_MEMORY_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 46 matching lines @@
   // When opening an existing object, this has no effect.
   size_t size = 0;
 
   // If true, mappings might need to be made executable later.
   bool executable = false;
 
   // If true, the file can be shared read-only to a process.
   bool share_read_only = false;
 };
 
-// Enumeration of different shared memory error types. Note: Currently only
-// errors from Mac POSIX shared memory implementation are fully instrumented.
-// TODO(asvitkine): Evaluate whether we want to keep this ability after
-// crbug.com/703649 is fixed and expand to all platforms or remove.
-enum class SharedMemoryError {
-  NO_ERRORS,
-  NO_FILE,
-  BAD_PARAMS,
-  STAT_FAILED,
-  TRUNCATE_FAILED,
-  NO_TEMP_DIR,
-  MAKE_READONLY_FAILED,
-  INODE_MISMATCH,
-  MMAP_FAILED,
-};
-
 // Platform abstraction for shared memory.
 // SharedMemory consumes a SharedMemoryHandle [potentially one that it created]
 // to map a shared memory OS resource into the virtual address space of the
 // current process.
 class BASE_EXPORT SharedMemory {
  public:
   SharedMemory();
 
 #if defined(OS_WIN)
   // Similar to the default constructor, except that this allows for
@@ skipping 126 matching lines @@
 
   // Returns a read-only handle to this shared memory region. The caller takes
   // ownership of the handle. For POSIX handles, CHECK-fails if the region
   // wasn't Created or Opened with share_read_only=true, which is required to
   // make the handle read-only. When the handle is passed to the IPC subsystem,
   // that takes ownership of the handle. As such, it's not valid to pass the
   // sample handle to the IPC subsystem twice. Returns an invalid handle on
   // failure.
   SharedMemoryHandle GetReadOnlyHandle();
 
-  // Returns the last error encountered as a result of a call to Create() or
-  // Map(). Note: Currently only errors from Mac POSIX shared memory
-  // implementation are fully instrumented.
-  // TODO(asvitkine): Evaluate whether we want to keep this ability after
-  // crbug.com/703649 is fixed and expand to all platforms or remove.
-  SharedMemoryError get_last_error() const { return last_error_; }
-
  private:
 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \
     (!defined(OS_MACOSX) || defined(OS_IOS))
   bool FilePathForMemoryName(const std::string& mem_name, FilePath* path);
 #endif
 
 #if defined(OS_WIN)
   // If true indicates this came from an external source so needs extra checks
   // before being mapped.
   bool external_section_ = false;
@@ skipping 10 matching lines @@
   SharedMemoryHandle::Type mapped_memory_mechanism_ = SharedMemoryHandle::MACH;
 #endif
 
   // The OS primitive that backs the shared memory region.
   SharedMemoryHandle shm_;
 
   size_t mapped_size_ = 0;
   void* memory_ = nullptr;
   bool read_only_ = false;
   size_t requested_size_ = 0;
-  SharedMemoryError last_error_ = SharedMemoryError::NO_ERRORS;
 
   DISALLOW_COPY_AND_ASSIGN(SharedMemory);
 };
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_SHARED_MEMORY_H_